Composite article



COMPOSITE ARTICLE Filed July 9, 1927' Patented oaks, i929 f UNITED STATES PATENT OFFICE GEORGE E. CHRISTENSON, JR., OF NORTH PLAINFIELD, NEW JERSEY, ASSIGNOR T JOHNS-MANWLLE coRroRATmmoE NEW YORK YORK, N. Y., A. CORPORATION OF NEW COMPOSITE ARTICLE Application led July 9, 1927. Serial No. 204,565.

, This invention relates to composite articles formed of rubber and metal, or analogous materials, and more particularly' relates to the provision of more satisfactory means for binding the materials togethe v The invention is particularly advantageous when applied to swab cups or packing cups for oil wells, which ordinarily comprise outer somewhatyieldable parts of rubber composition secured to inner metal sleeves which are -mounted upon the plungers of lifting pumps. v By reason'of the inevitable roughness and mechanical imperfections encountered in the oil pipes in common use in oil wells,thepackl ings of plungers of this character must encounter unusual strain, and therefore are desirably of very sturdy construction. Considerable diiculty has previously been encountered in the tendency' ofthe rubber'cup to tear away from the metal ring under actual, service conditions, while inthe manufacture of these swab cups, the separation of the metal ring and the composition packing haselng frequently occurred when the cup was removed from the forming mold.

Heretofore it has been common to form external threads or grooves in the metal ring and to l vulcanize the composition packing directly in placev with portions ofthe pack- 39 ing embedded in the grooves. The present invention affords a more effective union between the metal ring and the rubber packingI by providing an intermediate layer of agglutinous material having -circumferentially arranged strands, whichx'areadapted to .be located within the grooves. In its more specific aspect, this invention there: fore relates 'to the provision of' rubberized fabric which is firmly stretchedaround and secured to the threaded or grooved face of the metal ring, and tothe lvulcanization of the l cup in place upon the outside of this fabric,

thestrands of the fabric providing means for more firmly retaining the cup in place upon the ring.

l provements,

" Fig; 1 is a view offa swab cup constructed in accordance with.. my invention, the cup `the removing petroleum products from oil wells may comprise a rubber composition portion in the formk of airoutwardly flaring member provided with suitable slots in order to receive metal reinforcements or the like. For

example, Fig. 1 shows such a composition packing member designated by the numeral 1 and provided with the slots 12. In use a swab cup of this character ismounted upon a central plunger or swab head and a'suitable metal ring 2 vis provided tol engage this plunger.

The .present invention' discloses an -improved means for securing the cup 1 to ring 2.\` F orthis purpose the exterior surface of the-ring is threaded or grooved, as designated by` the" numeral 3. Thereupon one or lmore layers of rubberized fabric are stretched about the being desi vided -wit periphery' of the ring 2, such fabric overlapping skived portions v6, which may be firmly secured to each other during the manufacture of the cup. I t'will be evidentfrom an inspection of Fig. 3 that ated by numeral .4 and being prothe rubberized fabric -is arranged with strands `running in the samegeneral direction as the threads or grooves 3, it bein evident that the yieldable' nature of the bric permits close interfitting engagement of its inner facewiththe grooves upon the outer while its outer face reportion of the ring,- produces the grooves 3 in' less exact form, as

designated b numeral 5. The unvulcanized.

rubber whic is to form the cup 1 may be pressed into the corrugations '5 and the cup and rubberized fabric may then be compressed and vulcanized in av suitable mold -I while the overlapping fabric portions are Inthe drawings whlch illustrate my 1mfirmly held in place. The cup 1 is thus firmly welded. to the fabric, while the latter is maintained in interlocking engagement with the grooves 3. 1

The result-ing composite article formed of rubber composition and metal is of unusually sturdy construction, due to the interlocking of the rubberized fabric With the metal cup and the composition packing and due to the vulcanization of the overlapping fabric ends to each other as Well as to the packing. A joint 4of this character between the rubber composition cup 1 and the threaded exterior of the ring 2 has been found to be much more firm and sturdy than the type of unions previously provided in this art.

I claim:

1.y An article of the class described comprising a tubular member of material having the properties of a rubber composition, a circumferentially grooved ring, and strands impregnated in similar material and disposed in the grooves of the ring, the ring with the strands thereon providing an uneven peripheral surface, said member being vulcanized upon the uneven surface thus formed.

2. An article of the class described comprising a tubular member of material having the properties of a rubber composition, a circumferentially grooved ring, and rubberized fabric Wound about the grooved portion of the ring with its -face pressed into interfitting engagement with the grooves thereon, a'nd With' strands running generally in the direction of said grooves, the outer face of said Wound fabric being uneven to conform to the grooved periphery of the ring, said tubular member being vulcanized to said outer face.

3. An article of the class described comprising va tubular member of lmaterial having the properties of :i rubber composition, a grooved ring, and rubberized fabric 4Wound about thegrooved portion ofthe ring with its face pressed into intertting engagement With the grooves thereon, the outer face of said fabric being provided with less sharply ydefined grooves reproducing the groovesl said' member 'beingvulcanized upon the ring,

the outer face of the to said grooves upon fabric.

4. An articleof the class` described, com"- prising a metal member having a threaded portion, a member of rubber composition and means securing the'composition member to the metal member comprising a rubberized fabric Wound about the threaded portion of. the metal member and vulcanized thereon and to the rubber 'composition member, said fabric having overlapping portions vulcanized in place, and having an irregular outer face conforming with the threads upon thering, said rubber composition member being pressed into engagement with said outer face and vulcanized thereto.

5. An article of the class 'described comprising' a metal ring, apacking cup of rubber composition disposed about the ring, substantially circumferential grooves upon the periphery of the ring, rubber-impregnated fabric stretched about the ring and intertting with the grooves thereon, portions of said fabric being skived and adhesively held in overlapping engagement, said portions being vulcanized to each other, said fabric being vulcanized upon the grooves and having anV 

